I have found that this is almost certainly a sermon by Dudley Rutherford, senior pastor of Shepherd of the Hills Church in Porter Ranch, California. Google him for more information. He also does a Christian radio show. From a DVD of him retelling this story, it is nearly word for word this same story. Just FYI for the likely originator of this media.

I've never heard the history of F.S.Key's inspiration for our national anthem. Wonderful!